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 one year ago
The cost of manufacturing x items is given by C(x) = 0.02x^2 + 20x + 1800. Find the marginal cost function. Compuare the marginal cost at x = 20 to the actual cost of producing the 20th item.
 one year ago
The cost of manufacturing x items is given by C(x) = 0.02x^2 + 20x + 1800. Find the marginal cost function. Compuare the marginal cost at x = 20 to the actual cost of producing the 20th item.

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onegirl
 one year ago
Best ResponseYou've already chosen the best response.0This is what i did but my teacher says it wrong. C(x) = 0.02x^2 + 20x + 1800 C’(x) = 0.04x + 20 C’(20) = 0.04(20) + 20 = 20.8 so this will be the marginal cost at x = 20 Acutal cost of the 20th item : c(20)  c(19) = 0.02(20^2) + 20(20) + 1800 – 0.02(19)^2 + 20(19) + 1800 = 4380.78

onegirl
 one year ago
Best ResponseYou've already chosen the best response.0@agent0smith can u help?

julian25
 one year ago
Best ResponseYou've already chosen the best response.2c(20)c(19) = 2208  2187,22 = 20.78 it is just one algebraic mistake

onegirl
 one year ago
Best ResponseYou've already chosen the best response.0okay thanks so thats the marginal cost?

julian25
 one year ago
Best ResponseYou've already chosen the best response.2no! u already got the amrginal cost "C’(20) = 0.04(20) + 20 = 20.8 so this will be the marginal cost at x = 20 "

onegirl
 one year ago
Best ResponseYou've already chosen the best response.0ohh okay so what do i do next?

julian25
 one year ago
Best ResponseYou've already chosen the best response.2u wrote this "Acutal cost of the 20th item : c(20)  c(19) = 0.02(20^2) + 20(20) + 1800 – 0.02(19)^2 + 20(19) + 1800 = 4380.78 " i m telling u that part is wrong with algebraic mistakes

onegirl
 one year ago
Best ResponseYou've already chosen the best response.0so you're saying in that its where i made my sitake?

julian25
 one year ago
Best ResponseYou've already chosen the best response.2i made that calculations and i got c(20)c(19) = 2208  2187,22 = 20.78

onegirl
 one year ago
Best ResponseYou've already chosen the best response.0so how about the actual cost?

onegirl
 one year ago
Best ResponseYou've already chosen the best response.0@Loser66 so how would i find the actual cost? should i just substitute 20 into the first problem?

Loser66
 one year ago
Best ResponseYou've already chosen the best response.0sorry friend, I totally lost you in this question. I don't get why you subtract C(20 ) C(19)

onegirl
 one year ago
Best ResponseYou've already chosen the best response.0to get the marginal cost? i'm so confused :/

Loser66
 one year ago
Best ResponseYou've already chosen the best response.0I know why don't get you, hihi, it's economic problem. hand off, friend. never known before

julian25
 one year ago
Best ResponseYou've already chosen the best response.2hi again so what part u dont understand i think the problem is done

onegirl
 one year ago
Best ResponseYou've already chosen the best response.0i'm trying to figure it out what is the actual cost is? since we already found marginal cost

julian25
 one year ago
Best ResponseYou've already chosen the best response.2u have the marginal cost C’(x) = 0.04x + 20 C’(20) = 0.04(20) + 20 = 20.8 and the actual cost of producing the 20th item. c(20)c(19) = 2208  2187,22 = 20.78 the problem says that u must compare them and u can can see they r very close

julian25
 one year ago
Best ResponseYou've already chosen the best response.2how to do what? compare them? 20.8 is very close to 20.78 u dont need to do anymore
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